Eleven “is growing up and I think that’s the terrifying thing for Hopper,” Harbour said at MCM comic-con, per Digital Spy. “He doesn’t like the idea of his baby daughter hanging out with boys.”

“So the season starts with him a little bit uncomfortable,” he continued. “His daughter is becoming a teenager and beginning to find herself, so that’s scarier for Hopper than any Demogorgon creature that he’s going to have to deal with.”

Harbour said fans should be particularly excited for the season finale, “The Battle Of Starcourt”, of the impending third season. “You get to see a lot of that throughout the season and it’s very unexpected what happens in the end and it’s very, very moving,” he expressed. “I think episode eight is the most moving thing we’ve ever shot.”

Season three of “Stranger Things” premieres July 4 globally on Netflix.